Flavanoid ring systems

ABSTRACT

THE PRESENT INVENTION IS CONCERNED WITH COMPOUND OF TYPE I   Y&lt;(-C(-Z(-R4)(-R5)-R6)=CH-CO-C(=)-X(-R1)(-R2)(-R3)-C(=)-)   WHERE THE C(=)&#39;&#39;S ARE JOINED   WHEREIN Y IS O OR S, X AND Z ARE AROMATIC OR HETEROAROMATIC RINGS; R1, R2, R3, R4, R5, R6 ARE HYDROGEN, HALOGEN, AMINO, NITRO, HYDROXY, ALKYL, ARYL AND ALKOXY. THESE COMPOUNDS ARE USEFUL IN ALLECIATING ALLERGIC CONDITIONS SUCH AS ASTHMA.

i "nit-eel States Patent 3,816,466 Patented June 11, 1974 ABSTRACT OF THE DISCLOSURE The present invention is concerned with compound of type I R. B l l/l R is t1?" wherein Y is O or S, X and Z are aromatic or heteroaromatic rings; R R R R R 'R are hydrogen, halogen, amino, nitro, hydroxy, alkyl, aryl and alkoxy.

These compounds are useful in alleviating allergic conditions such as asthma.

The present invention relates to compounds of the formula:

wherein Y is or S, X and Z are aromatic or heteroaromatic rings; R :R R R R R are hydrogen, halogen, amino, nitro, hydroxy, alkyl, aryl and alkoxy.

Among the preferred compounds of this invention are those compounds wherein Y is oxygen or sulfur and X is benzene, naphthalene, quinoline or 1,2-benzothiazine and Z is benzene, pyridine or furan and R -R are hydrogen, halogen, nitro, lower alkyl, hydroxy and lower alkoxy.

The compounds of this invention when tested at a dose level of 25 mg./kg. intraperitoneally in guinea pigs according to the procedure described by O. H. Siegmund et al., J. Pharmacol. and Exptl. Therap., 90, 254 (1949'), exhibit bronchodilator activity. They are indicated in providing symptomatic relief in allergic conditions such as bronchial asthma. The dose for producing such a bronchodilator effect is about 25 mg. per kg. administered by intramuscular injection. This dosage regimen can be varied depending on the severity of the condition and the age and sex of the mammal being treated.

In order to use these compounds they are formulated with vehicles such as peanut oil or water for injection by a well known pharmacists art into dosage forms suitable for human or animal use.

Compounds of type I are prepared by the following reaction:

4 1 R z l o o CHO an... I R XI Ru II R; 1

whereby a compound of type II is heated in a solvent, such as toluene with aryl or heteroaryl aldehydes in the presence of catalytic amounts of a base, such as piperidine, to give compounds of type I.

The preparation of compounds of type II, when Y=O, is described in our copending patent application No. 174,947 (Substituted-o-Hydroxy-w-(MethylsulfinyDAcetophenones and Process for Producing Same). When Y=S, starting materials of type H are prepared by the reaction of methyl thiosalicylate with sodium methylsulfinylmethide in analogy to the corresponding reaction of methyl salicylate described by H. D. Becker, G. J. Mikol and G. Russel in J. Am. Chem. Soc., 85, 3410 (1963).

To further illustrate the practice of this invention, the following examples are included:

EXAMPLE 1 7-chloro-4'-hydroxy 3' iodo-5'-methoxyflav0ne.-A mixture of 11.6 g. of 4'-chloro-2'-=hydroxy-2-(methylsuliinyl) acetophenone, 11.9 g. of S-iodovanillin (Aldrich Chem. Co.) and 250 ml. of toluene was heated until a clear solution was obtained. The solution was treated with 0.5 ml. of piperidine, and refluxed for 1 hr. A heavy crystalline precipitate formed. The mixture was chilled, and the precipitate recrystallized from CH CN, MP. 226- 31; yield 9 g. (42%).

Anal.-Calcd. for C H CIIO C, 44.84; H, 2.35; I, 29.61. Found: C, 45.09; H, 2.27; I, 29.74.

EXAMPLE 2 o on,

6-chloro-3',4',5'-trimethoxyflavone.-A solution of 4 g. of 5' chloro 2' hydroxy 2 (methylsulfinyl) acetophenone, and 3 g. of 3,4,5-trimethoxybenzaldehyde (Aldrich Chem. Co.) in 50 ml. of toluene was treated with several drops of piperidine, and the solution refluxed for 1 hr. A heavy precipitate was formed. The mixture was chilled, and the precipitate was filtered, washed with cold toluene, and recrystallized from CH CN, M.P. 199.5 201.5; yield 4 g. (77%).

3 AnaL-Calcd. for C -H ClO C, 62.35; H, 4.36; CI, 10.22. Found: C, 62.65; H, 4.33; CI, 10.46.

EXAMPLE 3 6-bromo-3',4'-dimethoxyflavone.--'I'his was prepared in analogous fashion to 6-chloro-3',4',5'-trirnethoxy flavone from 5.54 g. of bromo 2' hydroxy 2 (methylsulfinyl)acetophenone, and 3.32 g. of veratraldehyde (Aldrich Chem. Co.). The material was recrystallized from CH CN, M.P. 200-04"; yield 5 g. (70%).

Anal.Calcd. for C H BrO C,56.53; H, 3.63; Br, 22.12. Found: C, 56.35; H, 3.42; Br, 22.14.

EXAMPLE 4 Br 0 H,

6 bromo 3',4,5'-trimethoxyflavone.This was prepared in analogous fashion to 6-chloro-3',4',5'-trimethoxyflavone from 5.54 g. of 5'-bromo-2'-hydroxy-2-(methylsuIiinyDacetophenone, and 4 g. of 3,4,5-trimethoxybenzaldehyde. The material was recrystallized from CH CN, M.P. 225.5-28"; yield 4 g. (51%).

AnaL-Calcd. for C H BrO C, 55.26; H, 3.86; Br, 20.43. Found: C, 55.46; H, 3.80; Br, 20.41.

EXAMPLE 5 7-chloro-2-(2-pyridyl)chromone.-This was prepared in analogous fashion to 6 chloro-3',4,5'-trimethoxyflavone from 6 g. of 4 chloro 2' hydroxy-2-(methylsulfinyl) acetophenone, and 2.75 g. of pyridine-Z-aldehyde (Aldrich Chem. Co.). The material was recrystallized from abs. ethanol, M.P. 208-13"; yield 2.5 g. (37%).

Anal.Calcd. for C I-I ClNO C, 65.26; H, 3.13; N, 5.44. Found: C, 65.39; H, 3.24; N, 5.52.

EXAMPLE 6 OCH: 0

H 0c m cm Gm 8-isopropyl-3',4,5'-trimethoxyflavone.--A solution of 4.8 g. of 2' hydroxy 3'-isopropyl-2-(methylsulfinyl) acetophenone, 4 g. of 3,4,5 trimethoxybenzaldehyde (Aldrich Chem. Co.) in 50 ml. of toluene was treated with a few drops of piperidine, and refluxed for 1 hr. The solution was chilled, and the crystalline precipitate filtered off, and recrystallized from abs. EtOH, M.P. 170.5-72; yield 3.5 g. (50% Anal.Calcd. for C H O C, 71.17; H, 6.26. Found: C, 71.24; H, 6.37.

4 EXAMPLE 7 8isopropyl-2-nitroflavone.--This compound was prepared in analogous fashion to 8-isopropyl-3',4'-dimethoxyflavone from 7.2 g. of 2'-hydroxy-3'-isopropyl-2-(methylsulfinyl)acetophenone and 4.5 g. of 2-nitrobenzaldehyde (Aldrich Chem. Co.). The material was recrystallized from abs. EtOH, M.P. Ill-14; yield 5 g. (54%).

A-nal.--Calcd. for C H NO C, 69.89; H, 4.89; N, 4.53. Found: C, 70.14; H, 4.94; N, 4.43.

EXAMPLE 8 CH3 CH3 EXAMPLE 9 OCH:

6-bromo-3-hydroxy-4'-methoxyflavone.-A mixture of 4.1 g. of 5-bromo-2-hydroxy 2- (methylsu1finyl)acetophenone, 2.24 g. of 3-hydroxy-p-anisaldehyde (Aldrich Chem. Co.) and 25 ml. of toluene was treated with several drops of piperidine, and refluxed for 1 hr. The solution was chilled, and the precipitate was filtered off, and recrystallized from abs. ethanol, M.P. 19294; yield 3 g. (58%).

AnaL-Calcd. for C H BrO C, 55.36; H, 3.19; Br, 23.02. Found: C, 55.10; H, 3.07; Br, 23.04.

EXAMPLE l0 '-chloro-2-hydroxy-8-methoxyflavone.-A mixture of 4.56 g. of 2'-hydroxy-3'-methoxy-2-(methylsulfinyl)acetophenone and 3.12 g. of 5-chlorosalicylaldehyde (Eastman Kodak Co.) in ml. of toluene was refluxed until a clear solution was obtained. Several drops of piperidine were added, and the mixture was refluxed for 1 hr. A heavy crystalline precipitate formed. The mixture was chilled, and the crystals were filtered and recrystallized from DMF, M.P. 338-40, yield 3.5 g. (58%).

Anal.Calcd. for C H ClO C, 63.48; H, 3.66; CI, 11.71. Found: C, 63.69; H, 3.68; Cl, 11.45.

EXAMPLE 11 5 H O Q OJ 1 10 5,6 dichloro-2'-hydroxyfiavone.This was prepared from 4.64 g. of 5'-chloro-2'-hydroxy-2-(methylsulfinyl) acetophenone, and 3.12 g. of 5-chlorosalicylaldehyde (D.P.I.) in analogous fashion to 5-chloro-2-hydroxy-8- methoxyflavone. The material was recrystallized from DMF, M.P. 293-98; yield 4 g. (65%).

AnaL-Calcd. for C H Cl O C, 58.66; H, 2.63; Cl, 23.09. Found: C, 58.83; H, 2.54; C1, 23.17.

EXAMPLE 12 2-(5-bromo-2-furyl)-7-chlorochromone.-A suspension of 7 g. of 4' chloro-2'-hydroxy-2-(methylsulfinyl)acetophenone and 5.25 g. of 5-bromofurfuraldehyde (H. Gilman and G. F. Wright, J.A.C.S., 52, 1170 (1930)) in 100 ml. of toluene was treated with several drops of piperidine, and refluxed for 2 hrs. The toluene was removed under reduced pressure, and the crystalline residue was recrystallized from abs. ethanol with the aid of charcoal. M.P. 179-81"; yield 6.0 g. (62%).

4'-hydroxy-3',6-diiodo-5'-methoxy flavone.This compound was prepared by reacting a mixture of 16.2 g. of 2-hydroxy-5'-iodo-2-(methylsulfinyl) acetophenone, 13.9 g. of 5-iodovanillin (Aldrich Chem. Co.) and 125 ml. of toluene in analogous fashion to 7'-chloro-4-hydroxy-3'- iodo-5 methoxy flavone. The material was recrystallized from CH CN, M.P. 2465-485"; yield 7.5 g. (29% AnaL-Calcd. for C H I O C, 36.95; H, 1.94; I, 48.80. Found: C, 36.68; H, 1.89; I, 48.76.

EXAMPLE 14 E OCH: CH3 CH:

3'-hydroxy-8-isopropyl-4'-methoxyflavone.A mixture of 6.5 g. of 2'-hydroxy-3'-isopropyl-2-(methylsulfinyl) acetophenone, 4.1 g. of 3-hydroxy-p-anisaldehyde (Aldrich Chem. Co.), and 125 ml. of toluene was heated until a clear solution was obtained. The solution was treated with several drops of piperidine, and refluxed for 1 hr. The solution was chilled, and the crystals that formed were filtered, and recrystallized from abs. ethanol, M.P. 158-60; yield 3.5 g. (42%).

Anal.-Calcd. for C H O C, 73.53; H, 5.85. Found: C, 73.45; H, 5.87.

EXAMPLE 15 2- (2-pyridyl) -4H-naphtho 1,2-b] pyran-4-one.A mixture of 10 g. of 1'-hydroxy-2- (methylsulfinyl)-2-acetonaphthone and 4.28 g. of pyridine-Z-aldehyde (Aldrich Chemical Co.) in ml. of toluene was heated until a clear solution formed. The solution was treated with 0.5 ml. of piperidine and refluxed for two hours. The solution was taken down to a solid residue under reduced pressure. The solid was dissolved in ethyl acetate and chromat0- graphed on a column of 300 g. of florisil. The crystalline product obtained on concentration of the first fractions was recrystallized from abs. ethanol, M.P. 169-71; yield 2 g. (18%).

Anal.Calcd. for C H NO C, 79.11; H, 4.06; N, 5.15. Found: C, 79.38; H, 4.09; N, 5.09.

EXAMPLE 16 6 bromo-5'-chloro-2'-hydroxyfiavone.This material was prepared from 5.54 g. of 5'-bromo-2'-hydroxy-2 (methylsulfinyl)acetophenone and 3.12 g. of 5-chlorosalicylaldehyde (D.P.I.) in analogous fashion to 5-chloro- 2-hydroXy-8-methoxyflavone. The material was recrystallized from DMF, M.P. 30408, yield 4.5 g. (64%).

Anal.--Calcd. for C H BrClO C, 51.24; H, 2.29. Found: C, 51.26; H, 2.38.

EXAMPLE 17 wry 3Q 5'-chloro-2-hydroxy-6-methoxyfiavone.-This material was prepared from 6.8 g. of 2'-hydroxy-5'-methoxy-2- (methylsulfinyl)acetophenone, and 4.65 g. of 5-chlorosalicylaldehyde (D.P.I.) in analogous fashion to 5-chloro- 2'-hydroxy-S-methoxyflavone. The material was recrystallized from DMF, M.P. 298-301 yield 5 g. (55%).

Anal.'Calcd. for C H ClO C, 63.48; H, 3.66; Cl, 11.71. Found: C, 63.38; H, 3.73; CI, 11.72.

7 EXAMPLE 1:;

OCH;

OCH;

2-(3,4-dimethoxyphenyl) 5 methyl-4H,5H-pyrano- [3,2-c]-1,2-benzothiazin-4-one 6,6-dioxide.--To a mixture of 9.45 g. of 4-hydroxy-2-methyl-2H-1,2-benzothiazin-3- yl(methylsulfinyl)methyl ketone 5,5-dioxide, 5 g. of veratraldehyde (Aldrich Chem. Co.) and 125 ml. of toluene was added 0.5 ml. of piperidine, and the mixture refluxed for 1 hr. The resulting solution was chilled, and the crystalline precipitate was filtered off, and recrystallized from CH CN, M.P. 27476, yield 6.5 g. (54%).

Anal.Calcd. for CZUHHNOSS: C, H, 4.29; N, 3.51; S, 8.03. Found: C, 60.09; H, 4.15; N, 3.71; S, 7.91.

EXAMPLE 19 CHqO OCH;

2-(3,4,5-trimethoxyphenyl) 4H [1,3]dioxolo[4,5-g] pyrano[3,2-c]quinolin-4-one.-This was prepared by reacting a solution of 7.3 g. of S-hydroxy-l,3-dioxolo[4,5- g]quinolin-Zyl(methylsulfinyl)methyl ketone and 5 g. of 3,4,S-trimethoxybenzaldehyde (Aldrich Chem. Co.) in 100 ml. of DMF in analogous fashion to 8,9-dimethoxy-2- (3,4,5 trimethoxyphenyl)-4H-pyrano[3,2-c] quinolin 4- one. The material was recrystallized from DMF, M.P. 31012; yield 4.5 g. (43%).

AnaL-Calcd. for C H NO C, 64.86; H, 4.21; N, 3.44. Found: C, 64.71; H, 4.12; N, 3.69.

EXAMPLE 20 2-(3,4-dimethoxyphenyl) 4H [1,3]dioxolo[4,5-g]pyrano[3,2-c] quinolin-4-one.This material was prepared by allowing to react a solution of 7.3 g. of 8-hydroxy-1,3- dioxolo[4,5-g] quinolin-7-yl(methylsulfinyDmethyl ketone and 4.12 g. of veratraldehyde (Aldrich Chem. Co.) in 100 8 ml. of DMF in analogous fashion to 2-(3,4-dimethoxyphenyl)-8,9-dimethoxy 4H pyrano[3,2-c]quinolin-4- one. The material was recrystallized from DMF, M.P. 260-*61, yield 2.5 g. (26%).

Anal.-Calcd. for C H NO C, 66.84; H, 4.01; N, 3.71. Found: C, 66.85; H, 3.99; N, 3.67.

EXAMPLE 21 OCH:

CH: 0 N

2 (3,4 dimethoxyphenyl) 7,8 dimethoxy 4H- pyrano[3,2-c]quinolin-4-one.This was prepared by allowing to react a solution of 9.27 g. of 4-hydroxy-7,8-dimethoxy-3-quinolyl(methylsulfinyl)methyl ketone and 4.98 g. of veratraldehyde (Aldrich Chem. Co.) in 50 ml. of DMF in analogous fashion to 2-(3,4-dimethoxyphenyl)-8,9-dirnethoxy-4H-pyrano[3,2-c]quinolin-4-one. The material was recrystallized from DMF, M.P. 24244; yield 1.5 g. (12.5%).

AnaL-Calcd. for 'C H NO C, 67.17; H, 4.87; N, 3.56. Found: C, 67.19; H, 4,66; N, 3.39.

EXAMPLE 22 EXAMPLE 23 OCH! 2 (3 hydroxy 4 methoxy phenyl) 8,9 dimethoxy 4H pyrano[3,2-c] quinolin 4 one.-A solution of 12.36 g. of 4-hydroxy-6,7-dimethoxy-3-quinolyl (methylsulfinyl) methyl ketone, and 6 g. of 3-hydroxy-p-anisaldehyde (Aldrich Chem. Co.) in 50 ml. of DMF was treated with 0.5 ml. of piperidine, and refluxed for 1 hr. The solution was chilled, and the crystalline product filtered, and recrystallized from DMF, M.P. 309-14"; yield g. (33%).

Anal.-Calcd. for C H NO C, 66.49; H, 4.52; N, 3.69. Found: C, 66.64; H, 4.56; N, 3.90.

EXAMPLE 24 (I) CH3 CH3 0 N 2 (3,4 dimethoxyphenyl) 8,9 dimethoxy 4H- pyrano[3,2-c]quinolin-4-one.--This compound was prepared by allowing to react 6.1-6 g. of 4-hydroxy-6,7-dimethoxy-3-quinolyl)methylsulfinyl)methyl ketone with 3.32 g. of veratraldehyde in 50 ml. of DMF in analogous fashion to 8,9-dimethoxy-2-(3,4,5-trimethoxyphenyl)-4H- pyrano[3,2-c]quinolin-4-one. The material was recrystallized from DMF, M.P. 290-92; yield 2.5 g. (31%).

Anal.-Calcd. for C H NO C, 67.17; H, 4.87; N, 3.56. Found: C, 67.29; H, 4.95; N, 3.35. 1

EXAMPLE 25 OCH:

CHa CH:

l 0 onto Y CHzO 8,9 dimethoxy 2 (3,4,5 trimethoxyphenyl) 4H- pyrano[3,2-c] quinolin-4-one.-.A suspension of 6.16 g. of 4-hydroxy 6,7 dimethoxy 3 quinolyl(methylsulfinyl) methyl ketone and 3.92 g. of 3,4,5-trimetroxybenzaldehyde in 100 m1. of DMF was treated with several drops of piperidine, and the mixture was refluxed for /2 hr. The mixture was chilled and the crystals was filtered, and recrystallized from DMS, M.P. 308-12"; yield 4 g. (47%).

Anal. Calcd. for C23H21N07: C, 65.24; H, 5.00; N, 3.31. Found: C, 65.52; H, 5.06; N, 3.20.

EXAMPLE 26 OC a OCH:

3 (3,4,5 trimethoxyphenyl) 1H naphtho[2,l-b] pyran-1-one.-A mixture of 7.44 g. of 2'-hydroxy-2 (methylsulfinyl)-1'-acetonaphthone and 5.88 'g. of 3,4,5- trimethoxybenzaldehyde (Aldrich Chem. Co.) in 125 m1. of toluene was treated with 0.5 m1. of pyridine, and the mixture was refluxed for 2 hrs. The solution was chilled, and the crystalline precipitate was filtered 01f, washed with cold toluene, and recrystallized from abs. EtOH, M.P. 162-64"; yield 7 g. (64%).

Anal. Calcd. for C H N0 C, 65.24; H, 5.00; N, 3.31. C, 72.87; H, 4.95.

EXAMPLE 27 3-[3,4-(methylenedioxy)phenyl] 1H naphtho[2,1-b] pyran-1-one.A mixture of 7.44 g. of 2-hydroxy-2- (methylsulfinyl)-1'-acetonaphthone and 4.5 g. of piperonal (Aldrich Chem. Co.) in 125 ml. of toluene was refluxed until a clear solution was obtained. Few drops of piperidine was added, and reflux continued for 1 hour, the mixture was chilled, and the precipitate was filtered off, washed with cold toluene and recrystallized from CH CN, M.P. 248 250; yield 6 g. (63%).

Anal.Calcd. for C H O C, 75.94; H, 3.82. Found: C, 76.17; H, 3.94.

EXAMPLE 28 OCH:

2 (3,4,5 trimethoxyphenyl) 4H naphtho[2,3-b] pyran-4-one.A mixture of 10 g. of 3-hydroxy-2-(methylsulfinyl)-2'-acetonaphthone, 8 g. of 3,4,5-trimethoxybenzaldehyde (Aldrich Chem. Co.), ml. of toluene,

1 1 and 0.5 ml. of piperidine was refluxed for 2 hrs. The mixture was chilled, and the crystalline precipitate was filtered, and recrystallized from toluene, M.P. 220-21; yield 7.5 g. (52% Anal.Calcd. for C22H1305: C, H, 5.01- Found C, 72.91; H, 5.04.

EXAMPLE 30 /s OCH:

EXAMPLE 31 CH: CH: i CHs--CHr- 0H '-bromo-2'-hydroxy 6 (1,1,3,3 tetramethylbutyl) fiavone.A mixture of 4.65 g. of 2-hydroxy-2-(methylsulfinyl -5 1,1,3,3-tetramethylbutyl) acetophenone, 3 g. of 5-bromosalicylaldehyde (Eastman Kodak Co.) and 125 ml. of toluene was warmed until a clear solution Was obtained, and 0.5 ml. of piperidine added. The solution was refluxed for 1 hr., chilled, and the crystalline precipitate was filtered, and recrystallized from abs. ethanol, M.P. 261-64"; yield 3 g. (47%).

Anal.Calcd. for C23H25BIO3Z C, 64.34; H, 5.87; Br, 18.61. Found: C, 64.27; H, 5.85; Br, 18.61.

EXAMPLE 32 5'-bromo-2'-hydroxy-l-thiofiavone.To a mixture of 120 ml. of DMSO and 240 ml. of benzene was added 8.8 g. of NaH (57% oil disp.), and the mixture was heated with stirring under a stream of nitrogen on a water bath at 78 for 1 hour. The clear solution that formed was cooled to 25 in an ice bath, the bath was removed and g. of methylthiosalicylate was added. The temperature rose to 45. The mixture was stirred for 1 hour, and diluted to 1 liter with anhydrous ether. The mixture was filtered and the precipitate was washed with anhydrous ether and dissolved in 60 ml. of H 0. The aqueous solution was chilled and adjusted to pH 6 with glacial acetic acid. A gum precipitated. The supernatant liquid was decanted from the gum, and the gum Was taken up in 125 ml. of toluene, 12 g. of S-bromosalicylaldehyde and 0.5 ml. of piperidine were added and the mixture was refluxed 12 for 2 hours. The dark red mixture was chilled and filtered. The precipitate was recrystallized from acetone with the aid of charcoal, M.P. 209Z14; yield 2 g. 10%

Anal.Calcd. for C H BrSO C, 54.07; H, 2.72; S, 9.62. Found: C, 54.15; H, 2.66; S, 9.74.

EXAMPLE 33 2 (3 hydroxy 4 methoxyphenyl) 4H naphtho- [2,3-b]pyran-4-one.-A mixture of 12.4 g. of 3-hydroxy- 2-(methylsulfinyl)-2'-acetonaphthone, 7.6 g. of 3-hydroxyp-anisaldehyde (Aldrich Chem. Co.) 125 ml. of toluene, and 0.5 ml. of piperidine was refluxed for 2 hrs. The mixture was chilled, and the crystalline precipitate was filtered, and recrystallized from CH CN; M.P. 225.5-275"; yield 9.5 g. (60%).

Anal.Calcd. for C H O C, 75.46; H, 4.43. Found: C, 75.30; H, 4.48.

EXAMPLE 34 -OCHI I OCH:

2-(3,4 dimethoxyphenyl) 4H naphtho[2,3-b]pyran- 4-one.-This compound was prepared by allowing to react 10 g. of 3-hydroxy-2-(methylsulfinyl)-2'-acetonaphthone with 6.8 g. of veratraldehyde (Aldrich Chem. Co.) in 100 ml. of toluene and 0.5 ml. of piperidine in analogous fashion to 2-(3,4,5-trimethoxyphenyl) 4H naphtho[2,3-b] pyran-4-one. The material was recrystallized from toluene, M.P. 198-200.5; yield 4.5 g g. (34% Anal.Calcd. for C H O C, 75.89; H, 4.85. Found: c, 75.81; H, 4.83.

EXAMPLE 3 5 S O C 3',4'-dimethoxy-1-thiofiavone.-To a mixture of 480 ml. of benzene, and 240 ml. of dimethylsulfoxide .Was added 17.6 g. of NaH, and the mixture was heated with stirring under a stream of nitrogen on a water bath at 78 for 1.5 hours. The clear solution was cooled to 25 in an ice bath, the bath was removed, and 20 g. of methyl thiosalicylate was added. The temperature rose to 50 and the mixture was stirred for 1.5 hours and diluted to 3 l. with anhydrous ether. The mixture was filtered and the precipitate was washed with ether and dissolved in 250 ml. of ice-H O. The aqueous solution was filtered through a layer of celite and the filtrate was adjusted to pH 6 in the cold with glacial acetic acid. A yellow gum precipitated which was crystallized by chilling and scratching. The crystals were filtered, washed With cold water and suspended in a solution of 20 g. of veratraldehyde (Aldrich Chem. Co.) in 250 ml. of toluene. The mixture was treated with 0.5 ml. of pyridine and refluxed for 2 hours, chilled and filtered. The crystalline product was R! recrystallized from CH CN with the aid of charcoal; l H

M.P. l63.564.5; yield 7 g. (20%). R Anal.-Calcd. for c,.,H,,o,s: c, 68.44; H, 4.73; s, X l I 10.75. Found: C, 68.55; H, 4.66; S, 10.63. 5

I Y I 2 R EXAMPLE 36 I Ru 0 wherein Y is oxygen or sulfur and X is naphthalene, and

Z is benzene, and R through R are hydrogen, halogen, hydroxy, lower alkyl, lower alkoxy and nitro. l 2. 8-[i]isopropyl-3',4,5-trimethoxyflavone. f 3. 3-(3,4,5-[t] trimethoxyphenyl) 1H naphtho[2,1-b]

L 5 pyran-l-one. K 4. 7-chloro-4'-hydroxy-3'-iodo-5'-methoxyflavone.

5. 6-chloro-3',4',5'-trimethoxyflavone. 6. 6-bromo-3',4-dimethoxyflavone.

' 6- 2-(4-pyridyl)-1-thiochromone.-To a mixture of 480 iafi g g ,i gg gggg ml. of benzene, and 240 ml. of dimethylsulfoxide was added 17.6 g. of NaH (57% oil dispersion) and the mix- 853 3ifig sgfiiffifiggg ture was heated with stirring on a water bath at ca. 78% 5. ch1o1 o 2. hydmxy smethoxyflavone' under a stream of nitrogen for 1.5 hrs. The clear solution 12 6 dich1om 2. hydmxyfiavone was cooled to in an ice bath, the bath was removed 25 4r: y y fidfiododflmethxyflavone.

and 20 g. of methyl thiosalicylate was added. The tem- 3thyd1.oXy 8jsoProPYlALmethoxYiiavone. perature rose to 50 and the mixture was stirred for 1.5 15 6 bromo 5, chloro z, hydroxyflavone hrs. and diluted to 3 1. with anhydrous ether. The precipi- 5, chloro z. hydroxy 6 methoxyflavone tate was filtered oif, washed with anhydrous ether and dis- (1 1 3 3 tetramethylbutyl) solved in 250 m1. of ice water. The aqueous solution was flavone.

filtered through a layer of celite and the filtrate was ad- References Cited justed to pH 6 in the cold with glacial acetic acid. A yellow gum precipitated which was crystallized by chilling and UNITED STATES PATENTS scratching. The crystals were filtered oflF, washed with cold 2,764,596 9/1956 Avakian et a1 260345.2 water and suspended in a mixture of 250 m1. of toluene 2,694,645 11/1954 Gleim 260345.2 XR and 12.7 g. of pyridine-4-aldehyde (Aldrich Chem. Co.). 3,046,275 7/ 1962 Kohlstaedt et al.

The mixture was treated with 0.5 ml. of pyridine and re- 260-3452 XR fiuxed for 2 hrs. The dark red solution was charcoaled 3,450,717 6/1969 Kramer et a1. 260--345.2 XR

and filtered. On cooling crystals formed in the filtrate. 3,495,009 2/ 1970 Tronche 260-3452 XR The crystals were filtered and recrystallized from ethyl acetate; yield 3 g. (11% M.P. 190 91.5. JOHN M. FORD, Primary Examiner Anal.--Calcd. for C I-I NOS: C, 70.27; H, 3.79; N, 5.85; S, 13.40. Found: C, 70.22; H, 3.74; N, 5.76; S, 13.47.

w claim; 260-345.5; 424-283; 260243 R, 294.8 D, 297 B,

1. A compound of formula: 283 3452 

